Has Mars always been cold and dry or was it once warm and wet? Reanalysis of spacecraft data reveals a signature from the surface rocks that indicates their composition has been altered in the presence of water.
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Mustard, J. A wet and altered Mars. Nature 417, 234–235 (2002). https://doi.org/10.1038/417234a
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DOI: https://doi.org/10.1038/417234a